253 entries under adjective topic. ×

6
thoughtless(feature, state, careless, wild)
5
aimless(value, insignificant, unimportant, irregular)
5
happy-go-lucky(feature, state, trait, unconcerned)
5
inefficacious(inferior, inadequate, limited, feeble)
5
shiftless(careless, thoughtless, purpose, reckless)
5
unreliable(careless, immoral, thoughtless, reckless)
5
unthinking(careless, careful, thoughtless, rash)
5
untrustworthy(careless, immoral, thoughtless, reckless)
4
bootless(weak, stupid, inferior, idle)
4
incautious(careless, wild, thoughtless, purpose)
4
negligent(feature, state, careless, indifferent)
4
nonchalant(feature, state, indifferent, trait)
4
powerless(dull, weak, little)
4
unaccountable(madcap, irresponsive)
4
unconcerned(feature, state, careless, indifferent)
4
undependable(careless, immoral, thoughtless, reckless)
4
vain(weak, value, inferior, insignificant)
3
blithe(feature, state, indifferent, trait)
3
cool(feature, state, indifferent, trait)
3
easy(feature, state, indifferent, trait)
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APASmart Define. (2015). feckless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/feckless/thesaurus/synonyms
ChicagoSmart Define. 2015. "feckless thesaurus" https://smartdefine.org/feckless/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, feckless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/feckless/thesaurus/synonyms>.
MLASmart Define. "feckless thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/feckless/thesaurus/synonyms>